There could be a "is in" option rather than only a "is not in"

I’ve been trying to make some rules that searches for all values of a database and gives a response if the a specific value is found in the database. It’s for a coupon system I’m creating.

I’m still struggling to create it, but I almost managed to do so in this following workflow:

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If there was an option of “is in” rather than only a “is not in” option, this workflow would be working perfectly. Since there isn’t this option, I’m still trying to find a way to make the system search for a certain value in a database.