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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef93bf33d0fac3a8772bda21cf7285dbe479435dea842def26e2152130a58862' 
  AND token = 'PcjJHjmhCO3WIMoXJ4dxVxkuhSQguG3HZxT/bbbg44A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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