30.4.5.9 The ps_is_account_enabled() Function
 
 
 
          Returns YES or NO to
          indicate whether Performance Schema instrumentation for a
          given account is enabled.
            An ENUM('YES','NO') value.
 
mysql> SELECT sys.ps_is_account_enabled('localhost', 'root');
+------------------------------------------------+
| sys.ps_is_account_enabled('localhost', 'root') |
+------------------------------------------------+
| YES                                            |
+------------------------------------------------+