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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '133b647852cf7b63ce58bc82837abf73b50d8138099b890454740ad2c7b4c309' 
  AND token = 'C30zpBAum2HYexmO5pv7pvt7Tg24F3LtpU0TwRXZD2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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