SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1805738989306fce58b9e269edb2c180099d5a2d033c99f9a653f48ca41741f1' 
  AND token = 'mVx1xZ+79060GouKPD/GXlLr9MlKUhtEjCULf3qjsw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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