if you mean the key to the church cellar that happens to be in the graveyard then you might like to know that there isnt one if you mean the key to the chest behind the ghost of arbenits on the alter in the center of the room anyways to get in to the graveyard cellar place you have to go kik the seekers out of the bar but avoid getting them in trouble with the liuetenant dude then go see merril on the barracks second floor and he tells you about the place then it's unlocked to complete the quest you get from it pick up the belt att the end of the place its on a bench
Hope that helped
