Restrict a vba find to column a only

This part of a code threw an odd anomoly when updating a record. It was because this apparently searches the whole used range

How can I restrict the search to used rows in column A only

        lRow = .UsedRange.Find(What:=Me.MP1CPCtxt_2, After:=.Range("a1"), LookIn:=xlFormulas, LookAt _
        :=xlPart, SearchOrder:=xlByRows, SearchDirection:=xlNext, MatchCase:= _
        False, SearchFormat:=False).Row
        MsgBox lRow

Any help appreciated