SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43bf5d1dcbb47b36c986f14fc939d3adf1530276fd568bf0b95f311d0f957f6b' 
  AND token = 'VBf/WZK/dBtYFpGN+dBWzQrYwgCpz3gSRZ/i7ysBSOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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