SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e62fdb7fbf5c199b899afa8ccee2c7254ebf182f1103964379cd5cc8f4796c1' 
  AND token = 'W1d80Gse2q8XiAaamTY9aBTr6qlJH9Xvjb5erh6fxBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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