SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4bc349ef1c265897a94ba8ba5441d9d78805729300b3fc2f1ba271ba795053' 
  AND token = 'Xmror4B4JAZFtFGr4jKz64ryELv9BefZg+q9K5MZ2JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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