MySQL: not quoting WHERE conditions slows query execution
First query should give you an error as you're filtering items with string, 
the datatype would be CHAR or VARCHAR.

If you you integer, in same columns, the query will rub without quotes but it will be slow because of string datatype.

Second Query is proper written, 

However for more performence, 
you can also create combine index on (parm1, parm2) with

CREATE INDEX tbl11 ON tbl1 (parm1, parm2))