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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9090d1c6b5877d765b8a736f5a6372fc63caa89c0bdeec28a2f24d5a3fce2d' 
  AND token = 'o8UbOy8AH97XHs8uu1L/4lwEOGHogutwGtKEajjO8eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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