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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f6299e553f706e541f10c070eb0e4a16d2e0ceb8e5b106c885e72c0ed8b8e3' 
  AND token = 'JLZfebM6Jw7dsvYP7RReRnto+L/45h3o/nD92PHnbj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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