I've never been stopped from getting to an airline club that's past the security check. The security people know what clubs are down there, know we don't necessarily have to fly to use them, and in my experience have always let me through with a membership card. (It probably doesn't even have to be a current one. They didn't seem to check that closely. OTOH, I don't know how they'd respond to that assortment of cards, from AmEx Platinum through all the partners, that get you into some lounges these days.)