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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71633ea2c60e8139ce9e3e9c8fda8d8143480cd0546d8bcb913301135cb2fba4' 
  AND token = '5hZC30p54tyncU6sV7x1QLG3TtqcUjw5gAJGoa5dr9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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