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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a555303ab36472fe9032a5483a95d069ce1d344556712a58747bd9dcd4a24484' 
  AND token = 'eIJbvJ8KXqW6zXC9Uvwu+X8aR+gnMIO5ydXxHonQ+/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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