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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5911e40900a0d4f767167d6f996f8aa9b9b71b1aeef4f9286eb41d16b453fc80' 
  AND token = 'VHsN3Wzkr2UqTyP4GA5pRzCBkFwD3u9d6u6eZJkvWsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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