SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f1b1a87a83a95c2fe4ef473462d48393822b0391155ba76ee528f4267bd855' 
  AND token = 'MwbvsSUPnDDBGcUIVRonflQZxgEyXO9gKP1mvYtQ8gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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