Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f3fb61759cbf642a563eda2ce1948425e408a4249ee7dfcaf647a4874c3866' 
  AND token = 'g4+fMphPxSx4fUX5R/bdi0gJBiA7qown460H77PA93U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}