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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5f917882888631d30489d9672687351b615ec21592cb1f3a9c536e5891fea48' 
  AND token = '5P/E+crHb8FG3w4uYHVPvkKswplUn8nmWuDCmdlx4eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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