Compare 2 adjacent cells each with a lot data for selected special match

Hi

First post so please forgive me if this is too difficult.

I have a spreadsheet with text in multiple cells in Cols A and B
I want to search for a specific piece of text in Column A
When it finds that text I want to search the corresponding cell in column B to verify if its also there or not
If it is there I want to print a relevant text message to corresponding cell in column C saying 'found' or 'not found'

E.g.
Say text in cell
A1 = /TD_1 is active
B1 = /TD_1 not available

I want to search for TD_1 and verify it matches both cells and output the result found into C1

Is VBA the best way to do this or can anyone help?
I have been searching Regex functions as well but I don't know how to use this properly in Excel

Thank you

Thanks sktner - that does work and it also allows for blank lines in the sheet which is great becasue I have those in my data. I have tested it and amended it a little too to show the 'not found' as there are a lot of keywords to search for. One problem though is that sometimes I have a cell that contains 2 keywords to search against. For instance

A1 = /TD_1 is active and GOOD - (keywords /TD_1 and GOOD)
B1 = /TD_1 not available and BAD - (keywords /TD_1 and BAD)

In this instance i want it to return a 'not found' match becasue even though both keywords are there the cells don't match. Im guessing its some sort of nested 'if' or else is it a collection? I.e. Can I put all the keywords into a collection to search against them ?

hopefully someone can
Thank you a lot for your help as well sktneer.
As I am new is there a way to reward assistance ? I don't know other than saying thanks.