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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56037bd6f20cfbc6d9944c8e0860b9999b4602b7f211f99cf5cb4f3a433ee1b9' 
  AND token = 'IPkIVgS/a6wrQNQzLmF08MGb8rWEQy/isdHUWVkpPi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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