Fold, or call?

[maverickai]

MP is 32.26/4.84/1.32 after 124 hands
BB no reads

Button ($5.07)
SB ($15.10)
BB BB ($2.00)
UTG ($7.24)
UTG+1 HERO ($24.92)
MP [color=#C00000]MP ($27.01)</font>
CO-1 ($9.83)
CO ($12.23)

Preflop: HERO is UTG+1 with J K
1 fold, HERO calls 0.25, MP raises to 0.50, 4 folds, BB calls 0.25, HERO calls 0.25.

Flop (1.60) 5 3 K
BB checks, HERO bets 0.25, MP raises to 0.50, BB calls 0.50, HERO calls 0.25.

Turn (3.10) 4
BB checks, HERO checks, MP bets 0.50, BB calls 0.50, HERO??

I put MP to be on the AK+. AK hand or big pair is pretty likely, as he dun really worry about my flop bet and also continued to bet on the turn. BB seems to be calling along and I have no reads on him. He could be chasing a flush draw, or have KJ+.

What should I do here? I believe I'm behind, esp to MP, but is the pot big enuff to warrant a call to the showdown?