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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f811dff4a242646ec50af528dfda29a57fd8a1584ace02fb9b88ebebd38b37' 
  AND token = 'MaT+GfIv2I3o9hwYG8PjtuRwb8KzxdVDCpRDho00pvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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