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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabfae953a78a52681952721abc179cf791d78d8279f2aee274f4f3306f587e2' 
  AND token = 'sY01XzMpOXvpZOq+OuCZeloU/M2YX58usSPcE1icNWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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