SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02efbfc9639de647f0a43876c1ad3ab1deb82be08dbc0cd6a3bb5e23e30611f5' 
  AND token = '9FUvYghiz67KUG9sELZZFtl+xi/CC1/K8IcjfKZ+uTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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