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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e806b84b012665c045fddb110a4f29f659469ad95dff6a01fb9430d73e6d4dc4' 
  AND token = '871aTIV18k/iIEnVNLZ54MADbfWAo25QpfBL7GIKqUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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