SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd8f5f9b691618b8b1d05bd318574075155084ebc20a9f36520280e47f37170' 
  AND token = 'tLvz4Y4LOOGnV+7ePDZjyYnCmw9SEv3BO7kRUja/arc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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