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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de550730c50b625c23b8906e81900a1bcb6c0bc9670900999f10fba4b8843b21' 
  AND token = '96sU+0qR8xSC/Wui8gst8/Q2HmVVznOD43rPDzsA20s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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