SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131d8bf2ba360b27decefa84e1a27c5ca8c2473450a96ac9f461fc10b70dc930' 
  AND token = 'Ftmgv8jevjdzr3JoJI1MBC7iNJwZSXVvu7gq+DWYUno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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