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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d5ced978a56a337eaee3d4ca33e45ffc1e8cdbeb363f5182775bac0077adff' 
  AND token = 'fyTmriLPqyTIFHoNLlovxwjwkTbDRbDPEE7Yb2xbnzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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