SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7daa0e8efc929823f7248cbcb650f7c65212199d41c0bfdb6fa9795de30579d' 
  AND token = '7qKk61BibPChg9HZJ3GLJgQiqJulQI63+nu48gpWI8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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