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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f92fd743e0df8f3d7d866079c167dc602437c349a2fc4f825a0aabe6cb37bd8' 
  AND token = 'nVWW9IUEM8VNNSfHZp3zPXo01ZWdu9TXoUTlNCQ1qyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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