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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2755fdc1a4432ae1022ed75c40aac7739f87b3f273c89f8f2cd0f873549c7ee7' 
  AND token = 'dmNbIhRzTSbWuOm1RxlGWPX7d8ayVk7axtSeK/oIFvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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