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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102f6cef8eb5851de3a096a0d18235630e8c48eaa3e33b101f644a57e0224810' 
  AND token = 'UkV+gFWXP4fXDzvmkMmpZ92dpWpI9MXJ902YJegd0CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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