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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ff6a181583e8f93774c9bdb430b4f11ece821db4bfe5f733742aa337e7c3ad' 
  AND token = 'hqvdoNSN8Yy7GGK3JBtn4V/ty04GvP2oE8DMJOuYw6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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