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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c92798517565616e2ca498c009d17f6db90e22574a6102a49959e6eff59b47' 
  AND token = '55UiFunVTRPe+7LArVr/H5hx6P0Zh2qWlMazbnIp0uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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