SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd030acf0a458f436c1b4b9509e1862cdca56f6c4f8c763a1876bf0fa8d6e224' 
  AND token = 'ihVixAm/Y5LPgY4D+/JxuqsOWEMePLww6/95Bd5Heq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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