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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21b76ee7482873a568a65f9a7a58bf0026a90471b596c56d765596b5ef14a7cf' 
  AND token = 'HSDUIjrLMttL2mI8eia3vovd30knrR0D1o7l6hGkq+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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