SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a5d84603b5d618df2dad90016da3496e12c1e9758adee9038939c310d5dc20d' 
  AND token = 'iTobiYYXnKKuvZPkhVVpVDh2KGuj6lJLU2B5VTF2j3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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