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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b69206630c66e63502e4b2c1a6e24e3c7f8bb7baa77ba51553f6f181a2374c1c' 
  AND token = 'Wxt0Dzi60e99qJ3uCysX67hxMGn0UtbLgebaeb6+UPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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