SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb95260f78729471f6b99beadfd5cfa8f682f04cb796990d706e883c88c2650' 
  AND token = 'N3WMKz84ZTJ4CLANUG4fC/n1u6zpmc6VFLpHhhHS+/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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