SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4c574fc4e4ec9fd30e21d6fb845687aba565a14f3feb3284b7715baf626ed3' 
  AND token = 'uQB4yuwtBB/3J0bmoqJqRLdFzmRYnv+hEWnT+tYisvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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