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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9962d95745b61d3b56e313299ab2d1d79ff08f8909cd5464fb8eb15ee33b08' 
  AND token = '7HrtIWuzbs64vJZGg4MP9z4nPZAZbX5TIEbYbiS01cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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