Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ec51d811958fbce432326106045cd209f523da1bd0da845deca1f897560f5b' 
  AND token = 'JOnECzjRG2BYypYsQyGOK6SRp1x2/iiLHWjlv4kJdO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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