SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82509e6fee2c678f2fab8f91b7c130bb72cd3f82f044f1e5ae5aed47d8489f9d' 
  AND token = 'us/aNmJctSQeKyppBJnuWnQIzdwClOhqip1oH1qUhkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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