SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd131f27d964e79bc569dd3fa4f8e635585cc01c01ce5d9d5b48754e9b8ea49' 
  AND token = '9iHTezZuu/+ofnwI+/WKSe6JYo+fwivQZVBQdGzHwco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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