I can't put villain on a range here. His turn call looks a ton like a draw though, but then his flop call makes no sense unless he's decided to stick around with 45. I guess KcJ or QcJ is possible or some PP with a club. He could have a made flush here (or a poorly played set), but I think it's too likely that we're ahead to worry about being kind.

Anyway, our hand's really good and villain's range is unclear (at least to me), so I bet 3/4 pot and don't fold.

Note: The more I think about it, the more I think this line looks like a badly played flopped set. I really don't like this spot much. Maybe check/call is best?