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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570003ddd860df0a5eaf1375fd081ff9e15b75ca6b4374ae968167dfb2d9f4f1' 
  AND token = '5HBib99oZzN6u5qs5qsDiK6z7sxIgVqqxff9qCVTcFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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