SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9647c3e12bc8cc8c9c9e305a85f98612e412b46829788db8904a2b3c6e341b3e' 
  AND token = 'UrGzbBNyj/tqv5h5HQZl3+BlqRZEWYkVZgqEKDV192o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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