SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13b974e1190ec3660f9bb0e374a7c83c358aa4c007f5457ea74f8fb5484873a' 
  AND token = 'KbtMBFPQZ8L/Yz+hn8XuTj161YcLjjpYrCWK4JzwI84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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