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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4cc262d41f969805c0dafbbde34150e9eb239b24256fc909fa84ebc931e4045' 
  AND token = 'RQyLP7hWqIrDW40dJ32cgqQA7834rqvMUvQ503iaffU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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