SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f2969bf84bc10b84b2f910c09a3490dd1f620670763b8d8514a2ec1c58b007' 
  AND token = '/56yuyIovfzkwuzh/5pKa4ZMlX9P7w4WxwWpRSGrgFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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