Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c210722cd9a2fce0680c52b13ec5479df0e258ad894c81e28f14306c4c9e86a' 
  AND token = '2nl2my3yxC3EQt6ztp0eof4ZMvPscEUtWCmGfqYDalw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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