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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da326aaf599626bb80e5e64ff234fd4a2b572e12ea8a8840cdbc9ff41b9425b9' 
  AND token = 'uepgXDE9+Mr8eRrWmum8XU5kF43GGSOOuPs7d0SJZfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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