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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb370116ad49a6c486c84884de18b8192c511f6034a7d5d3ca1c3b49f658d5a1' 
  AND token = 'rpZZe2w8Q0XHcF5TW06r9AMxROhMzcaFJIg16of5xQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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