SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4e35f09b937c62f9f58e68fe22ec77e01982c5d7143dcf5dbc524a4dd286d6' 
  AND token = 'bW+UNKWu/GDClIqYwtwaB/FKC1zYFYq/FyN0+23Ctxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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