Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311e3478c86cda332e5ea3dab62734ceb80b777211afa849e744fe0a1c3e0eb7' 
  AND token = 'WZl2OQniv+5qeCZ5SeRSt2oTs7CvgEphyo+/fLd+sNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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