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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ea1417029990241efc66c6d988f1c43684f5c6c75ef125779fb94430f8a54ad' 
  AND token = 'fCxdnTWglklg8apQ7ipYz/jqhiyyc9aTFG+yp/CDqgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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