Does this zone file hash belong to this subdomain?

def is_subdomain_zonefile_hash(self, fqn, zonefile_hash, cur=None):
        """
        Does this zone file hash belong to this subdomain?
        """
        sql = 'SELECT COUNT(zonefile_hash) FROM {} WHERE fully_qualified_subdomain = ? and zonefile_hash = ?;'.format(self.subdomain_table)
        args = (fqn,zonefile_hash)

        cursor = None
        if cur is None:
            cursor = self.conn.cursor()
        else:
            cursor = cur

        rows = db_query_execute(cursor, sql, args)
        
        count = None
        for row in rows:
            count = row['COUNT(zonefile_hash)']
            break

        return (count > 0)