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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a5a4c71c13cbde69f8d0d697a9c2fb39412bf79f71a1020a630ba2d626509f' 
  AND token = 'Q+4R6WS0kpZ3lmX+coObm3AeSDJdzAQu+v008BtenXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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