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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6d4fd6eea842440ef72a74a7e9aee4b8c35baed01fb1929d848a9cff40a4ba' 
  AND token = 'SyAgLZ/SKoqc60FhlByJlx9Z+QzuBuirnKRfJH4p0JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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