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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9ff41e081dcf49cca486f7ff831d566c012f936500578529149c79fae3e098' 
  AND token = 'UCHH6cvBGB7GiTvW+qAf+lw63yymImACv79tM48TjcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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