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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38df9d0f4ed178afe854772a272f56d7684aaa6f03db655c8bf8de9ba8b4b6ba' 
  AND token = 'FXRBQ03jXe0YtViES1Jtw8UhnEBzJ8v2xt2+On2NnAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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