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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db37ffb98fe87628a2a120fc21f2564bb6816b9b38e144fa19246ef13ac01d6' 
  AND token = '5FIruYrhTMd2SFrORki94SqJ4SEz+oGc0/Fru9zF7f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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