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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350f876ac4153b79ab7adf4ec7304c6953671a4e47219a71ad2c6fa6bb878d3d' 
  AND token = 'KCHoC0CslIBxyytXHAcU2wwDvsQ4Z1iueatAm9fRen0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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