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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0bd4d735a542c0e7237caff58a46f7ea6d3587a4acd0fa8acf9c5eb5426dc4' 
  AND token = 'lcJRoVEe2dH/lQiKAojme7gZIUT8/gONZQmYvRs7Zlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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