Move BINARY modifier to make MYSQL use index again

program/include/rcube_user.php

@@ -359,12 +359,11 @@ class rcube_user
         $dbh = rcmail::get_instance()->get_dbh();
 
         // use BINARY (case-sensitive) comparison on MySQL, other engines are case-sensitive
-        $prefix = preg_match('/^mysql/', $dbh->db_provider) ? 'BINARY ' : '';
+        $mod = preg_match('/^mysql/', $dbh->db_provider) ? 'BINARY' : '';
 
         // query for matching user name
-        $query = "SELECT * FROM ".get_table_name('users')." WHERE mail_host = ? AND %s = ?";
-
-        $sql_result = $dbh->query(sprintf($query, $prefix.'username'), $host, $user);
+        $query = "SELECT * FROM ".get_table_name('users')." WHERE mail_host = ? AND username = $mod ?";
+        $sql_result = $dbh->query($query, $host, $user);
 
         // query for matching alias
         if (!($sql_arr = $dbh->fetch_assoc($sql_result))) {