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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbead1e713253c78b3383dd163e1a0947563b52ee6932bd2586cea679d3fdf1b' 
  AND token = 'P5+Fwku0h9iUYrXOD3MUWcHXBMal9W7S8Y9Mo0hzlsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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